Stitch-forming mechanism for sewing-machines.



W. N. .PARKES'. STITCH FORMING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED SEPT 8, 1905.

1,141,092. Patented May 25, 1915.

4 SHEETSSHEET l- W. N. PARKES.

STITCH FORMING MECHANISM FOR SEWING MACHINES.

v APPLICATION FILED SEPT- 8, 1905. 1,141,992.

Patented May 25, 1915.

4 SHEETSSHEET 2.

INVENIOR W. N, PARKES. STITCH FORMING MECHANISM FOR SEWING MACHINESAPPLICATION FILED SEPT-811905- 1,141,092. Patented May 25, 1915.

4 SHEETS-SHEET 3.

w. N. PARKES. STITCH FORMING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED SEPT- 8, I905.

Patented May 25, 1915.

' 4 SHEETS-SHEET 4.

. ED STATES WILLIAM N. PARKES, F BROOKLYN, NEW

COMPANY, OF NEW YORK, N. Y.,

YORK, ASSIGNOR TO THE PARKES MACHINE A CORPORATION OF NEW YORK.

STITGH-FORMING MECHANISM FOR SEWING-MACHINES.

To all whom it may concern:

Be it known that I, WILLIAM N. PARKns, a citizen of they United States,residing in Brooklyn, county of Kings, and State of New York, haveinvented a new and useful Improvement in- Stitch-Fo-rming Mechanism forSewing-Machines, of which the following is a description.

This invention is intended for use in the class of sewing machines inwhich the needle" is reciprocated in the direction of its length, andmoved laterally at right angles to said .direction, and it is disclosedin connection with a rotary looper mechanism of a lock stitch type.

The main object is to provide a stitch forming mechanism, for this typeof machines, in which the cooperative relations between the variouselements of which it is composed are maintained inthe difierent lateralpositions of loop engagement.

When the well known differential movement is used the hook is revolvedonce to each thrust of the needle, and its speed is accelerated so thatit is substantially doubled during loop engagement, and when the wellknown plurality movement is used rapid loop engagement is secured byrevolvmg the hook twice to each thrust of the needle, under whichmovement the hook has one idle rotation.

In order to make lateral stitches without moving the material laterally,means are provided for moving the needle laterally, and when thiselement is incorporated in a stitch forming mechanism, it causes a displacement between the hook and the other elements of the stitchformingmechanlsm.

For example-in this kind of machines the when it moves in an oppositedirection.

In machines of the prior art known to applicant, the movement of theneedle laterally relative to the hook causes horizontal, and verticaldisplacements between the hook and theneedle as is well known.

In sewing machines the feed, take-up and hook, are timed to act relativeto the vertical movements of the needle, and when the needle ismovedlaterally without changing Specification of Letters Patent. P t t d May25, 1915, Application filed September 8, 1905. Serial No. 977,633.

x i 1 1 its position/vertically, it is obvihus that t e relative timingbetween. the movements the feed take-up and needle is not Idistairhed,

but the timing between these elements and the hook is disturbed. I

' he take-up is timed to act with the hook, an especially in relation tothe glijc harge of the loop by the same. Loop disx'inences after thehook has made a little over one half of a revolution from the point ofloop taking, and the action'of the take-up is timed to commence to drawup the loop at the time the hook commences to discharge the same.To-theextent that the needle is moved laterally in the same direction asthat in which the beak of the hook moves, the dis, charge of the looprelative to the movement of the take-up and the feed, is retarded, andvice versa.

Referring to the drawings; Figure 1 is a front elevation partly insection, showing the invention applied to the stitch forming mechanismof a sewing machine, and Fig. 2 is a rear elevation of saidmachi'ne;Fig. 3 a face view of thehead of. the machine with parts removed, andFig. 4=is a vertical sectional view showing detailsof construction inconnection with the needle bar; Fig. 5 is a top plan view of theinvention, including a part of the hook mechanism; Fig. 6 is an argecomendview on line H of Fig. 5, and looking vention is to maintain therelation vertically between the eye of needle 'andthe-heak of the hook,so as to accomplish theresnit indicated in Fig. 8. This result isaccomplished, in the present, form of my invention byzrotating the hooktwice to each thrust fifths needle in such a manner, that it isautomatie cally kept in time with the vertical move ments of the needlein the different lateral positions of loop engagement.

In sewing machines the hook is said to be timed faster when it isadjusted forward on its bearings, and slou er when it is adjusted in adirectionopposite to its forward move- I ment. That is to say. when thehook is adjusterl circularly relative to the hook shaft and-in the samedirection-in which said shaft revolves, it is timed faster relative tosaid shaft and also faster relative to all other necessary to adjust thehook in time with said other parts. Moving the needle later-- allyrelative to the hook puts the hook out of time with theneedle and allother parts of the machine, but does not disturb the timing,

of said other parts. This will be understood when it is remembered thatall parts are timed to act relative to the vertical movements of theneedle, and the movement of the needle laterally does not'change thetime of its vertical movement relative to said other parts. But changingthe needle laterally does change its position. relative to the hook atpoint of 100 engagement, because as before noted the ook has to movefarther to reach the needle in second loop taking position than in thefirst and vice versa,

In my invention the function of keeping the position of the eye of theneedle relative to the beak of the hook, the same in the differentlateral positions of loop engagement is accomplished by automaticallytiming or adjusting the hook faster as the needle moves laterally in thedirection in which the-hook moves, and slower as the needle moves in theopposite direction.

In the-drawing, 1 indicates the arm of the machine, 2 the base, 3 theupperor drive shaft, 4 the lower or driven shaft.- The movement'of thedrive shaft 3 is transmitted to the lower shaft 4 by means of a sprocketwheel 5 mounted on the drive shaft, and a sprocket wheel 6 mounted onthe driven shaft, and a chain 7 is in engagement with said sprocketwheels, the sprocket wheels are of equal diameter, so. that the upperand lower shafts revolve in unison with each other. The driven shaft 4may be driven in any usual manner.

In suitable bearings in the face of the machinefis located and free toturn a needle bar 8, on which is mounted a part 9, in which the bar isalso free to turn, the said part 9 has formed on it t stud 10, on whicha bearing 11 formed onthe lower part of a link 12 is mounted. On theupper end of said link 12 is formed a bearinglB which is pivoted on acrank pin 14, located in a usual manner in the outer end of a usualtake-up cam 15 whichlatteris attached to the driving shaft 3 of themachine. Collars 16 and -17 which are attached to the needle bar 8 meansfor retaining the part 9 from turning with the needle bar 8 as well asconnecting the link 12 with said bar.

To the bar 8, is attached an arm 19, in

said bearing by a collar 24, the part 22 being freeto turn on the s; 'dpart 23. A pitman 25 is by means of a ball joint connection 26 connectedat one end to the arm 21, and at its other end, adjustably connected ina way 27 formed in a usual segment lever 28, which latter is attached toa shaft 29. The seg ment lever 28 is operated by means of a usual switchcam 30 which latter is mount ed on the shaft 3 of the machine. To thelower end of the needle bar 8is attached an Offset needle holder 31which carries a needle 32. A take-up 33 is operated in a usual manner bymeans of the take-up cam 15.

It will now be understood that by the means just described the-needlebar is reciprocatedvertically and oscillated laterally on its verticalaXis,-and that when so oscillated the needle 32 is moved laterally aboutthe axis of the needle bar. Theswitch cam 30 is constructed so as tomove the needle laterally once to each reciprocation of the same,.andthese partsare so timed that the needle is moved laterally during thetime it is disengaged from the Work. By adjusting the end of the pitman25 in the way 27 toward the pivot of the lever 28, the extent of lateralmovement of the needle is decreased and vice versa, and when the lever25 is adjusted directly over the axis of the shaft 29 theneedle has nolateral movement and the stitch-forming mechanism under such adjustmentis adapted for plain straight way stitching.

In a suitable bearing as shown in Fig. 1,

a short shaft 33. is mounted to turn, said,

shaft having a reduced portion 34 which is located in the forward end ofthe shaft 4, and to the free end of said shaft 33 'is attached a bevelgear 35 which meshes with a like gear 36, the latter being attached to ashort vertical shaft 37 which is mounted in suitable hearings in themachine. To the upper end of the short vertical shaft 37 is attached ahook 38,'on which is formed a beak 39. This hook may be constructed inany usual manner.

. On suitable bearings at 40 is pivoted. a yoke lever 41, having a yokeportion 42, in which are secured pins 43, on which are pivoted-anti-friction rollers 44. These'rollers 44 are located in-acircumferential groove 45 formed in a sleeve 46, the latter beinglocated so as to embrace the ends of the. shafts 4 and 133 as shown inFigs. 1 and 7.

In the sleeve 46 is-formed inclined slots 47 and 48. which incline inopposite directions as shown in Fig. 5, on the opposite side of thesleeve l6 are formed inclined slots (not shown) which are coincidentwith the slots 47 and 48. On pins or other suitable bearings 4:9 and 50,suitable rollers are pivoted to engage the respective walls of the slotsa7 and 48, pin 50 is located in shaftd and pin l9 in shaft 33", and thedifplibate of these pins and rollers are located in the grooves or slots(not shown) in the opposite side of the sleeve 46.

To do rear end of the short transverse shaft 29 is attached a segmentlever 51, in which is formed a way or groove In the said groove 52 isconnected at 58, one end of a link 54, the other end of said link beingconnected at to a lever 56, .which latter is connected at 57 to thevertical portion. of the arm of the machine. To the lower end of thelever 56, is pivoted at 58, in any suitable manner, a link connection59, the forward end of said link connection is pivoted at to the end ofthe yoke lever 41.

The axis-of the hook 38 is located concentric with the needle bar 8, andthe needle moves in a path laterally concentric with said axis, as shownin Fig. 5. The hook 38 is adapted to carry a bobbin case which isomitted in Fig. 5 of the drawing.

The eye of the needle in sewing machines runs transverse to the needleand said loop is thrown out laterally, with respect to the longitudinalaxis of the needle across the path of the beak of the hook, by referringto Fig. 5, it will be understood that, the loop of needle thread willextend across the path of the beak of the hook the same, relative tosaid beak, in any ofthe lateral positions of the needle, and as theneedle moves laterally in a path concentric with the path of the beak ofthe hook, it is seen that there are no unfavorable conditionshorizontally in this stitch-forming mechanism, byreason of the lateralmovement of the needle.

The means by which the relation between the needle and the hookhorizontally are maintained, are not per se, claimed in thisapplication, but the combination of my present invention withthese-means are claimed.

The operation of the invention will now be described: The end of thelink 25, is adjusted in the way 27, so as to produce the desired extentof lateral movement of the needle. Thesegment lever 51 being secured totheoscillating shaft 29, it, the said segmentlever, is moved laterallyin unison with. the segment lever 28. To cause the loop engagingposition of the beak of the hook or locper to change circumferentiallyor "laterally the extent the needle is changed ,laterally,

the end of the link 54: is adjusted in a direction away from the pivotof the lever 51, a sufiicient extent to transmit lateral movement enoughto the sleeve 46 for the purpose. Assuming that the parts first tosecond loop taking position, or'Ti position shown in dotted lines inFig. 8. This movement of the lever 28, causes the lever 51 to movetoward the forward end of the machine, and this movement is transmittedto the connection 54, and through it to the le-' ver 56, and from thelatter to the connec .tion 59, which is moved toward the rear end of themachine; the movementof this connection swings the yoke lever 41 on itspivot, and through the connection between it, and the sleeve 46 suchsleeve is also moved toward the rear of the machine. .As the sleeve 46is moved toward the rear end of themachine, the engagement of therollers in the inclined slot 47, causes the sleeve to rotate relative tothe shaft 4, and the engagement between the rollers 49 and the inclinesd8, causes the shaft 33* to rotate relatively to the sleeve 46,-theextent these slots are inclined, determines of course the extent thesleeve will turn relative to the shaft 4, and the shaft 33", relative tothe sleeve. By this use of double sets of slots inclined in oppositedirections, the shaft 33* is caused to rotate relative to the shaft 4,twice the extent of the incline of the slots' The gear 35 being twicethe diameter of the gear 36, the movement produced by the inclined slots47 and 48, is doubled when it reaches the hook. The dottedposition ofthe beak of the hook in Fig. 8, indicates the change in the adjustmentor in the timing of the hook under the operation of the mechanism justdescribed, when the needle is moved from first to second loop takingposition. It will be seen that the hook has been automatically timed oradjusted forward, so that its beak reaches loop taking position relativeto the eye of the needle, just the same as in first loop takingposition, and when the needle is moved from the first loop takingposition, it is of course understood that movements, the reverse ofthose just described take place, that is, the hook is automaticallytimed or adjusted slower, and con-- theheak of the hook, as

llO

sequently, the loop taking conditions becharge may as usual commenceafter the hook has rotated a little over one half around from secondloop taking position, and that therefore the hook is in time with thetake-up, the same as though no lateral movement had been given theneedle, and this condition prevails of course, when the needle movesfrom second to first loop taking position.

It is thought that it is now understood that means are provided, bywhich the rela' tion between the point of the hook and the eye of theneedle vertically is maintained in any of the lateral positions of looptaking; that the time or adjustment of the hook is automatically changedso as to accomplish this result, and that said automaticchangemechanism, as it is evident that the inven- I tion may be applied toother parts of the machine. y 7

Having now described my invention, what I claim as new is v 1. In asewing machine, stitch forming mechanism comprising, in combination, alooper, a. reciprocating needle, adjustable meansto vibrate said needlelaterally between any selected paths of reciprocation within a field ofvibration, which said paths of reciprocation intersect different pointsin the looper-beak path, and'means automati-cally varying the operationsof the looper and needle with respect to each other for formingsubstantially the same Width of loop and in the same relation to thelooper, in all the lateral positions to which the needle may bevibrated.

2. In a sewing 'machine, stitch forming mechanism comprising, incombination, a

looper, a reciprocating needle, adjustable means to vibrate said needlelaterally between any selected paths of reciprocation within a field ofvibration which said' paths of reciprocation intersect different pointsin the looper-beak'path, and means efiecting cooperation of thelooper-beak and the needle at substantially uniform time in the cycle ofmachine-operation and with substantially the same relation between theeye of the needle and the looper-beak, in all the different lateralpositions to which the needle may be vibrated.

8. In a sewing machine, stitch forming mechanism comprising, incombination, a

looper rotating unidirectionally, a needle vibrating laterally betweendifferent paths of reciprocation intersecting points in the looper-beakpath at different-degrees about the center of rotation of the looper,and means effecting cooperation .of the needle and the looper-beak, inthe-different lateral positions of the needle, at substantially uniformtime in the cycle of machine-operation.

4. In a sewing machine, stitch forming mechanism comprising incombination, a looper, a needle vibrating laterally between paths ofreciprocation which intersect points in the looper-beak path atdifferent degrees of cyclic progression of the looper, and meanseifecting cooperation of the looperbeak and the needle, in the differentlateral positions to which the needle is vibrated, at substantiallyuniform time in the cycle of machine-operation, with substantially thesame relation between the eye of the needle and the looper-beak, andafter substantially uniform withdrawal of the needle-eye toward thelooper-beak path.

5. In a sewing machine, stitch forming mechanism comprising, incombination, a looper rotating unidirectionally, a needle, adjustablemeans to vibrate said needle laterally between any selected paths ofrecipre cation within a field of vibration, which said paths ofreciprocation intersect dif ferent points in the looper-beak path, andmeans effecting cooperation of the looperbeak and the needle, in all.the different lateral positions to which the needle may be vibrated, atsubstantially uniform time in the cycle of machine-operation, withsubstantially the same relation between the eye of the needle and thelooper-beal and after substantially uniform withdrawal of the needle.eye toward the looper-beak path.

6. In a sewing machine, stitch forming mechanism comprising, incombination, a e.

looper, a needle, adjustable means to vibrate said needle laterallybetween any selected paths of reciprocation within a field of vibration,which said paths of reciprocation intersect different points in thelooper-beak path, of means wherebysaid looper and the eye of the needlecooperate at substantially the same time in the cycle ofmachine-operation and the distance along the needle between'the'needleeye and the looper beak is the same at the time of cooperation, in

all the lateral positions to which said needle may be vibrated.

7. In a sewing machine, stitch forming mechanism comprising, incombination, a looper, rotating unidirectionally, a needle, adjustablemeans to vibrate said needle laterally between any selected paths ofreciprocation within a field of vibration, which said paths ofreciprocation of the needle intersect different points in thelooper-beak path, and means whereby said looper and the eye of theneedle cooperate at substantially the same time in the cycle of machineoperation and the distance along the needle between the needle eye andthe looper-beak is uniform at the time of cooperation, in all thelateral positions to which the needle may be vibrated.

8. In a sewing machine, the combination of a looper, a needle,adjustable means to vibrate said needle laterally between selected pathsof reciprocation which intersect dif ferent points in the loopenbeakpath, and a take-up, said needle looper and take-up having the same.relative time of coiiperation in all the different lateral positions towhich the needle may be vibrated.

9.'In 'a sewing machine, the combination with a unidirectionallyrotating looper, a needle, and means to vibrate said needle laterallybetween paths of reciprocation which intersect different points in thelooper-beakpath, of compensating mechanism effecting cooperation of thelooperbeak with the needle at substantially uniform time in the'cycle ofmachine-o iieration, said compensating mechanism controlled by theneedle-vibrating means.

10. In a sewing machine, the combination with a looper. rotatingunidirectionally, a rotating shaft, and a laterally vibratingneedle-holder, of positive driving connections between said shaft andthe looper and means acting on said driving connections to accelerate orretard the loopcr to effect cooperation between the loopor and theneedle, in any of the paths of reciprocation of said needle, atsubstantially uniform time in the rotation of said shaft.

11. In a sen-ingmachine, stitch forming mechanism con'iprising, incombination, a ioopcr, a needle, means to vibrate said needle betweendifferent pa lbs of reciprocation intersecting the path of looper-bcakmovement at (.li'licrcnt points in the latter and means for adjustingthe range of vibration of said needle, of a takcaxp, and means forcll'octing cooperation of the looper and needle in uniform relation tothe time of the takcup in any of the lateral positions of the needle.

12. In a sewing machine, stitch forming mechanism having a reciprocatingneedle, mechanism for moving said needle laterally, a continuouslyrevolving looper, and mechanism for changing the time of rotation ofsaid looper to maintain the coinicrating re lations between the same andthe needle.

13. A stitch forming mechanism for a sewing machine comprising alaterally movsaid rotating shafts with. respect to the other rotatingshaft whereby the cooperative relation between said needle and the hookis maintained in the lateral positions of loop engagement.

14. A stitch forming mechanism coinprising a needle and a hook, meansfor operating one of said elements comprising a shaft, :1 second shaft,a sleevemounted so that it engages each of said shafts, means wherebywhen said sleeve is moved laterally one of the shafts is rotatedrelative to the other, coiiperative connection between the hook and saidsecond shaft and means for moving said sleeve laterally.

15. A sewing machine comprising a needle, means for reciprocating andmoving said needle laterally, a looper adapted to coiiperate with saidneedle, means for revolving said looper a plurality of times to eachthrust of the needle, a device for increasing and (lCl(-5{1Sl1lg.tllpredetermined times the speed of rotation of said looper to maintain itscotiperative relations with the needle, and means for operating saiddevice.

16. A. stitch forming mechanism for a sewing machine comprisingavertically reciprocating needle adapted to be moved laterally, anoperating looper that has a con tinuously-revolving movement, mechanismincluding a moving. part for moving the needle laterally and meansintermediate said mechanism and the looper whereby the speed of rotationof the latter is automatically changed from the moving part of saidmechanism. i

17. A stitch forming mechanism for sewing machines comprising areciprocating needle, a shaft, a second shaft, a hook adapt ed tocooperate with said needle operated by said second shaft, a part inengagement with each of said shafts, a plurality of inclined groovesformed in said part, means carried by said shaft in engagement with saidgrooves. and means for moving said part longitudinally of said shafts. v

In testimony whereof I have hereunto signed my name in the presence oftwo subscribing witnesses.

tVILL-IAM N. PARKES.

' Witnesses:

J. B. MGGIRR, WM. JV. Ksrcnnar.

